5V DC Soil Moisture Sensor Relay Module for Automatic Irrigation What this does and why you need it Monitors soil moisture and automatically activates a connected valve or pump when moisture falls below a set threshold, preventing over- or under-watering and cutting water waste. Provides reliable, hardware-level switching so your irrigation device is driven directly and isolated from the controller, reducing risk to the microcontroller. Designed for compact control boxes and small projects where dependable, low-power moisture control is required. Key benefits Water savings and healthier plants: waters only when needed to maintain consistent soil moisture. Safe, dependable control: relay output isolates pumps or solenoid valves from your 5V controller for robust operation. Easy integration: made for 5V systems and works smoothly with common microcontrollers such as Arduino and ESP series. Space-efficient and durable: standard PCB module with rugged components that fit tight enclosures. Responsive and efficient: sensitive moisture detection, quick relay response to changes, and low standby current for long-term projects. Core features Function: Moisture sensing input triggers relay output to drive irrigation devices when soil moisture falls below a threshold. Compatibility: Operates on 5V DC and integrates with popular microcontroller platforms; relay provides electrical isolation between controller and irrigation load. Size and material: Compact PCB module built with durable components suitable for control boxes and small-scale installations. Performance: Stable operation with sensitive detection and fast relay switching; designed for low standby power consumption. Typical use scenarios 1) Indoor herb gardens and potted plants: automatically waters pots when soil becomes dry, keeping moisture levels consistent without daily monitoring. 2) Raised beds and drip irrigation zones: used in zone controllers to activate valves only when needed, improving water efficiency across beds. 3) Greenhouse seedling trays: maintains steady moisture for young plants by switching pumps or valves on and off in response to soil conditions. Integration and placement Fits standard DIY and professional 5V irrigation projects and is suitable for mounting inside control boxes or small enclosures. Simple wiring to a microcontroller or manual threshold system makes it practical for automation tasks.